Integrated Pest Management for the Cereal Leaf Beetle
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1 Integrated Pest Management for the Cereal Leaf Beetle Darrin L. Walenta Extension Agronomist NE OR Phone: Malheur Co. Entomology Short Course Four Rivers Cultural Center, Ontario, OR February 19, 2013
2 Objective Overview of CLB History/Background and Economic Implications CLB Biology, Phenology & Injury Symptoms Integrated Pest Management Options
3 Cereal Leaf Beetle Oulema melanopus (Coleoptera:Chrysomelidae) Native to Europe and Asia First official record in U.S. = Michigan 1962 Now widespread across eastern & mid-western states and into Canada First found in OR, ID & WA in 1999
4 ODA IPPM Annual Survey = 24 infested counties in 2012
5
6 Yield Loss Potential Small Grains Yield Loss = damage level + crop stage/vigor dryland vs- irrigated, low vs- high vigor In OR and WA, yield losses up to 25% in spring wheat and 18% in winter wheat have been observed In eastern/mid-western states, yield losses up to 55% in spring wheat and 75% in oats & barley Low yield impact when damage occurs during late head fill
7 Acreage Treated & Estimated Cost of CLB Control in OR Acres Treated $900,000 $800,000 $700,000 $600,000 $500,000 $400,000 $300,000 $200,000 $100,000 Estimated Cost Year $0 Acres Treated Estimated Cost
8 CA Exterior Quarantine for CLB CLB not found in CA..restrictions for certain ag products entering CA Small grains, straw/hay, grass sod, grass & forage seed, fodder/plant liter, Christmas trees, used harvesting equipment & machinery CLB-infested counties products must be certified by state department of ag the shipment has been treated for CLB Cleaning, fumigation Non-CLB infested counties must certify the origin from un-infested counties (County of Origin Certificate) Exemptions do exist Part of crop transported, previous use, packaging type, time of year, etc.
9 CLB Host Crops & Weeds Many grass crop, forage and weedy species Small grain winter vs- spring Corn Sorghum Rice Timothy Orchardgrass Millet Brome spp. Reed canarygrass Fescue spp. Ryegrass spp. Bluegrass wild grasses native & introduced Wild oat Quackgrass Jointed goatgrass foxtail
10 CLB Damage on corn
11 CLB Turfgrass seed Heavy CLB damage on Per. ryegrass in Marion County Seedling grass seed fields may serve as over-wintering sites for new adults.
12 CLB Life Stages - Adult Approx. ¼ long Black head Orange-red thorax & legs Metallic, bluish-black wing covers (elytra) Chew completely through the leaf Drop to the ground when disturbed
13 CLB Life Stages Adult Lookalike spp. Several other small beetles that may look similar. Soft-winged flower beetle (Coleoptera: Melyridae) Native predator feeds on aphids, alfalfa weevils and immature stages of several other insects. Lookalike Collops sp. (left) and adult CLB (right). (Photo by G. Clevenger)
14 CLB Life Stages Larva ~ 1/16 at 1 st instar ~ ¼ at 4 th instar Black head, pale yellow body under black slime (fecal material) Resemble small slugs Diana Roberts, WSU Extension
15 CLB Life Stages Larva Inter-veinal feeding Consume mesophyl & upper leaf cuticle window-pane or frosted appearance 90% of damage during last 2 instar stages Active 3 to 4 weeks Control needed prior to this stage if infestation at or above threshold
16 Extremely isolated case of FROST damage?
17
18 CLB Life Stages Larva Larva disappear mid to late June Drop to ground Pupate in soil within earthen cells (difficult to find) CLB pupa (Photo by G. Clevenger)
19 Life Cycle (1 generation/year) Cereals Mature corn New stands of grasses Adult Egg Larva Pupa Adults (over-wintering) (new summer) April May June July
20 CLB Phenology Malheur Co. Over-wintering adults can emerge late March Eggs = early to mid-april 4 th instar larvae = late May to early June (approximately ¼ in length)
21 CLB Habits & Preferences Adults over-winter in protected sites near grain fields Grain stubble, grass crowns, permanent vegetation, riparian areas, etc. Adults very active on calm, sunny days Prefer spring planted grains (e.g. oats) Can migrate to successively younger stands Females begin laying eggs ~ 2 weeks after emergence can lay up to 300 eggs over 6-week period New summer adults Do not mate Dormant during high heat (aestivation period) Migrate to any available grass host (corn, grass seed, other) to feed prior to over-wintering Mortality over-winter can range 40-70% Extreme temperatures, introduced / natural predators
22 IPM Options Field Scouting Primary tool in all IPM programs! Correct identification of the pest Start when temps reach mid-50s and continue through early grain fill Winter wheat = 2 nodes present Spring grain = soon after emergence (1 2 leaf, adult damage concern) Goal = determine peak 1 st & 2 nd instar larvae Monitoring over time helps determine peak levels: adult infestation - egg laying - larvae development
23 IPM Options Field Scouting 10 X 10 scouting technique Check 10 tillers every 10 acres W pattern across field, check field edges apart Record # of eggs, larvae per tiller and flag leaf (adults?) High % eggs.scout again a few days later Data sheet available in OR CLB IPM publication later in 2013
24 IPM Options Economic Thresholds Current Threshold Levels: Small Grains Pre-Boot until Flag Leaf Fully Emerged (Feekes 1-8): 3 larvae and / or eggs per tiller Boot stage and later (Feekes 9+): 1 larvae per tiller Flag leaf contributes ~50% of photo-synthates during early to mid-grain fill (Simmons, 1987)
25 CLB Impact on Soft White Spring Wheat Yield Union Co. Treatment Larvae per Tiller 1 Larvae per Flag Leaf 1 Flag Leaf Damage 2 Yield Loss # # % area % 2004 No Insecticide Insecticide No na 19 Insecticide Insecticide na 0 1 Approximately 14 days after insecticide application. 2 Flag leaf defoliation determined when 90% of CLB larvae initiated pupation.
26 CLB Impact on Soft White Winter Wheat Yield Union Co. Early detection can help reduce yield loss, improves bio-control and no slimy pants!
27 Options for Integrated Pest Management IPM is based on interactions between pests beneficial organisms environment crop Relies on natural mortality factors & control tactics that cause least disruption to such factors (e.g. natural predators, weather) Important IPM Tactics = monitoring and utilizing multiple control practices Chemical Cultural (limited) Biological
28 IPM Options Insecticides: Small Grains Several foliar-applied products registered for CLB 2012 PNW Insect Management Handbook Several of these products also registered for use in field corn and/or silage corn Be Sure and Follow Label Instructions! Various restrictions for grazing, forage, fodder, hay, straw & grain (PHI, max amount applied per season, etc.)
29 IPM Options Insecticides: Small Grains IRAC Site of Action Group # Product 1 A Lannate 3 A Baythroid XL 3 A Silencer, Warrior 3 A various pyrethrins 5 Radiant SC 15 Dimilin 2L
30 IPM Options Insecticides: WHEAT only IRAC Site of Action Group # Product 1 B chlorpyrifos (various) 3 A Tombstone 3 A Proaxis 3 A Mustang Max (and triticale) 1 B + 3 A Cobalt 1 B + 3 A Stallion
31 IPM Options Insecticides: Barley only IRAC Site of Action Group # Product 3 A + 4 A Endigo ZC Insecticide Resistance Management - CLB Rotate site of action groups, avoid consecutive use of same group Tank mixtures /pre-mixes with different site of action group # One application typically will control CLB infestation Timing is Key! Monitor treated CLB populations for efficacy
32 Insecticide Resistance Management - CLB Rotate site of action groups avoid consecutive use of same group Tank mixtures /pre-mixes with different sites of action Must be registered for intended use! Timing is Key! Typically, only one well-timed application is needed for CLB control Monitor treated CLB populations for efficacy Using IPM tactics help prevent resistance development
33 IPM Options Insecticides: Small Grains Note: new requirements for pyrethroid products in Precautionary Statements section of label.. Buffer Zones 10 ft vegetative filter strip between field edge and down gradient aquatic habitat.plus. 25 ft no spray buffer zone..plus Spray Drift Prevention Requirements Droplet size medium or coarser (ASAE S572 standards) Measure wind speed prior to application (adjacent to site prior to application, upwind side) More on label
34 IPM Options Cultural Control Tactics Sound agronomic practices that favor well-established stands Vigorous, well-tillered, non-stressed plants Tolerate damage from CLB infestations below threshold levels CLB-resistant varieties not identified yet in PNW Resistance mechanism = leaf hairiness Oat trap crop management tactic CLB adults prefer small, young oat plants for egg-laying Seeding oat border strips 2 weeks after spring wheat effective (Roberts et al. 2010) Untreated oats provide refuge for introduced and natural predators
35 IPM Options Oat Trap Crop Tactic
36 IPM Options Biological Control Tactics No natural predators when CLB first arrive in new area Insecticides first line of defense Introduced CLB-specific parasitoid wasps have been used over the last 40+ years Successful example of classic biological control Natural enemies are imported and released in a new region for permanent establishment Once established, help maintain CLB populations below economic threshold levels w/o insecticides
37 Oregon CLB Bio-control Project ODA, USDA-APHIS and OSU
38 CLB larval parasitoid Tetrastichus julis Adults lay eggs in CLB larva. T. julis larva develop within the host while the CLB-larva continues to feed on the crop until pupation. T. julis overwinters in the ground within the CLB pupa & earthen cell
39 T. julis larvae recovered from CLB larva Mike Cooper, Idaho State Department of Agriculture
40 ODA IPPM Annual Survey = 24 infested counties in 2012
41 CLB Treated Acreage Trend for NE Oregon NE Oregon Total 90% + parasitism rates! First parasitoid wasp releases Many fields 75% + parasitized A few fields 50-75% parasitized
42
43 Untreated areas within treated fields and near field borders promote survival of introduced parasitoids and natural predators Convergent lady beetle Hippodamia convergens
44 Closing Comments CLB IPM has proven very effective in established areas Occasional hot-spots do occur Since 2007, less than 1000 acres in NE OR have needed CLB control Monitor CLB populations levels then consider Does it meet/exceed the economic threshold level? What percentage of the population are eggs? Do small larvae make up the majority of the population? Are the CLB larva parasitized? If so, at what level? CLB larva samples can be tested by contacting the OSU Plant Clinic ( ) If control necessary, leave untreated area within field to serve as refuge for T. julis
45 IPM Resources Insecticide Resistance Action Committee OSU - IPPC Western Region IPM Center
46 Any Questions? Thanks!
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